/*
 * Copyright (C) 2008 Rob Cash
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * StateChangeListener.java
 * 
 * Created on Jan 1, 2009 at 12:42:29 PM
 */

package org.robcash.commons.event;

import java.util.EventListener;

/**
 * Receives notification of state machine changes
 * @author Rob
 */
public interface StateChangeListener extends EventListener {

    /**
     * Receive notification that a state change is about to occur
     * @param evt State change event
     */
    public void stateChanging(StateChangeEvent evt);

    /**
     * Receive notification that a state change has taken place
     * @param evt State change event
     */
    public void stateChanged(StateChangeEvent evt);

}
